<!DOCTYPE html>
<html>
<head>
  <title>jQuery 示例1 - Hello World</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
  <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2 class="text-muted"> jQuery 示例1 - Hello World </h2>
  <div class="container">
  	<label id="practice" class="text-success"></label>
  </div>
</div>

<script>
$(document).ready(function(){
  $("#practice").html("Hello World! This is a JQuery practice. ");
});
</script>

</body>
</html>